Standards & Quality
API Monogram
A licensed product marking used within an API conformity program; buyers should verify the supplier license scope and status for the product concerned.
Original procurement definitions
Oilfield Equipment Glossary
Understand common equipment, inspection, document, pressure-control, drilling, artificial-lift and export terms before comparing supplier quotations.
119 terms
Standards & Quality
API Specification
A published API technical document used to define equipment, material, testing or documentation requirements in a purchase contract.
Standards & Quality
Product Specification Level
A defined level within certain equipment specifications that changes required materials, quality controls, traceability, testing or documentation.
Standards & Quality
Performance Requirement
A specified validation or performance level that may apply to particular pressure-containing equipment and should be stated explicitly in the RFQ.
Standards & Quality
Material Test Report
A traceable quality document reporting material identification, chemical composition, mechanical properties and the test standard used for a heat or batch.
Standards & Quality
EN 10204 3.1 Certificate
A type of inspection document commonly requested for metallic products, showing specific inspection results validated by authorized manufacturer personnel independent of production.
Standards & Quality
Certificate of Conformity
A supplier or manufacturer statement that the delivered goods conform to identified purchase-order, drawing, specification and inspection requirements.
Standards & Quality
Factory Acceptance Test
A planned test at the manufacturer or assembler facility used to confirm agreed functions, records and acceptance criteria before shipment.
Standards & Quality
Hydrostatic Test
A pressure test using a liquid medium to check pressure-containing integrity under a specified procedure, pressure, hold time and acceptance criteria.
Standards & Quality
Nondestructive Examination
Inspection methods used to look for surface or internal discontinuities without intentionally damaging the part being examined.
Standards & Quality
Ultrasonic Testing
A nondestructive examination method that uses high-frequency sound to assess thickness or detect certain internal discontinuities in suitable materials.
Standards & Quality
Magnetic Particle Inspection
A surface and near-surface examination method for ferromagnetic materials that uses magnetization and visible or fluorescent particles.
Standards & Quality
Liquid Penetrant Testing
A surface examination method in which a penetrating liquid and developer reveal discontinuities that are open to a nonporous surface.
Standards & Quality
Heat Number
An identifier assigned to a steelmaking heat that allows material records and test results to be connected to marked components.
Standards & Quality
Traceability
The ability to follow a product, component or material back through identification marks, manufacturing records, inspections and source documents.
Standards & Quality
Calibration Certificate
A record showing that measuring or test equipment was compared with traceable references and documenting the result and validity period.
Standards & Quality
Dimensional Inspection Report
A record comparing measured product dimensions with drawing, tolerance or specification requirements using identified inspection equipment.
Standards & Quality
Inspection and Test Plan
A sequenced plan listing manufacturing inspections, tests, records, responsibilities and purchaser witness or hold points.
Standards & Quality
Witness Point
A notified inspection stage that the purchaser or inspector may attend, while work may normally proceed under the agreed plan if attendance is waived.
Standards & Quality
Hold Point
A mandatory inspection or approval stage beyond which manufacturing should not proceed until the authorized party releases the activity.
Pressure Control & Wellhead
Wellhead
The pressure-containing assembly at the top of a well that supports casing or tubing and provides interfaces for valves, spools and tree equipment.
Pressure Control & Wellhead
Christmas Tree
An assembly of valves, fittings, chokes and outlets installed above a wellhead to control production or injection flow paths.
Pressure Control & Wellhead
Casing Head
A lower wellhead body that connects to the surface casing and provides support or sealing arrangements for subsequent casing strings.
Pressure Control & Wellhead
Tubing Head
A wellhead body above the casing spool that supports the tubing hanger and provides controlled annulus access and sealing interfaces.
Pressure Control & Wellhead
Adapter Spool
A pressure-containing spool used to connect equipment with different nominal sizes, pressure ratings or end-connection arrangements.
Pressure Control & Wellhead
Gate Valve
A full-opening isolation valve that uses a moving gate between seats and is commonly specified by bore, pressure rating, material and actuation.
Pressure Control & Wellhead
Choke
A restriction device used to control fluid flow or pressure drop, supplied in fixed or adjustable designs with defined trim and service conditions.
Pressure Control & Wellhead
Choke Manifold
A pressure-control assembly of valves, chokes, fittings and lines arranged to route and regulate flow under a specified working pressure.
Pressure Control & Wellhead
Kill Manifold
A manifold assembly arranged to route fluid toward pressure-control equipment or a well through defined high-pressure connections and valves.
Pressure Control & Wellhead
Blowout Preventer
Pressure-control equipment installed to close or seal around the wellbore using ram or annular closing elements under approved procedures.
Pressure Control & Wellhead
Ram BOP
A blowout preventer that uses opposed ram blocks selected for pipe, variable-bore, shear or blind closing functions.
Pressure Control & Wellhead
Annular BOP
A blowout preventer with an elastomeric packing element designed to close around a range of tubular shapes or an open bore within rated limits.
Pressure Control & Wellhead
Working Pressure
The rated maximum internal pressure for specified service conditions, which must be distinguished from test pressure and system operating limits.
Pressure Control & Wellhead
Test Pressure
The pressure applied during a defined acceptance or proof test; it is not automatically the permissible continuous operating pressure.
Pressure Control & Wellhead
Temperature Class
A specified temperature range designation used with some pressure equipment to communicate validated material and performance limits.
Pressure Control & Wellhead
Material Class
A purchaser-selected material designation used for particular pressure-equipment service conditions and normally stated with other specification levels.
Pressure Control & Wellhead
Flange
A bolted end connection with specified dimensions, facing, pressure rating and sealing arrangement used to join pressure-containing components.
Pressure Control & Wellhead
Ring Gasket
A metallic sealing ring matched to a ring-groove profile and material requirement for a designated flanged pressure connection.
Pressure Control & Wellhead
Stud Bolt
A threaded fastener used with nuts on pressure flanges, selected by diameter, length, material grade, coating and required tightening procedure.
Pressure Control & Wellhead
Hammer Union
A quick make-up union used on oilfield flow lines, identified by figure, size, pressure rating, seal arrangement and service compatibility.
Drilling & Downhole
Drill Pipe
A tubular drill-string component with upset ends and tool joints that transmits rotation, axial load and drilling fluid.
Drilling & Downhole
Drill Collar
A thick-walled drill-string component used to provide weight, stiffness and directional behavior near the bottom-hole assembly.
Drilling & Downhole
Heavy Weight Drill Pipe
A heavier transitional drill-string tubular placed between drill collars and conventional drill pipe to manage stiffness and fatigue concentration.
Drilling & Downhole
Stabilizer
A bottom-hole assembly tool with blades or pads used to control stand-off, support directional behavior and reduce unwanted lateral movement.
Drilling & Downhole
Bottom Hole Assembly
The lower drill-string tool combination selected for drilling, directional, measurement and formation-interaction functions below the drill pipe.
Drilling & Downhole
Drill Bit
The cutting tool at the lower end of a drilling assembly, selected by design, size, connection, formation and operating envelope.
Drilling & Downhole
Mud Motor
A downhole positive-displacement motor that converts drilling-fluid hydraulic power into rotation for a bit or other tool.
Drilling & Downhole
Drilling Jar
A downhole impact tool designed to deliver an upward or downward impulse when a drill string or bottom-hole assembly becomes stuck.
Drilling & Downhole
Shock Sub
A downhole tool intended to absorb or isolate axial shock and vibration within defined load, stroke and drilling conditions.
Drilling & Downhole
Crossover Sub
A short adapter tool used to join components with different thread forms, sizes, shoulders or connection orientations.
Drilling & Downhole
Fishing Tool
A tool designed to engage, recover, release, cut or remove lost or stuck objects from a wellbore under a planned recovery procedure.
Drilling & Downhole
Overshot
An external-catch fishing tool that passes over a fish and uses a grapple or similar mechanism to engage its outside surface.
Drilling & Downhole
Spear
An internal-catch fishing tool that enters a tubular fish and uses slips or a grapple to engage its inside surface.
Drilling & Downhole
Junk Basket
A fishing or cleanout tool designed to collect small loose metal, cuttings or debris from the bottom of a wellbore.
Drilling & Downhole
Milling Tool
A cutting tool used to remove or dress down metal, cement or downhole obstructions under a controlled milling program.
Drilling & Downhole
Kelly Valve
A drill-string safety valve installed in the kelly or similar position to provide an isolation function when operated under the applicable procedure.
Drilling & Downhole
Tool Joint
The threaded pin-and-box end connection welded or formed on drill pipe to make up drill-string joints and transfer loads.
Drilling & Downhole
Rotary Shoulder Connection
A threaded drill-string connection that develops its seal and load transfer through controlled shoulder contact and make-up torque.
Drilling & Downhole
Thread Compound
A formulated compound applied to threaded connections to influence friction, sealing, galling resistance and make-up behavior.
Drilling & Downhole
High Pressure Flowline
Rigid or flexible pressure-rated piping and fittings used to transfer oilfield fluids between connected equipment under defined service conditions.
Tubular & Handling
Casing
Steel tubular installed and cemented in a well to support the bore, isolate formations and provide structural or pressure integrity.
Tubular & Handling
Tubing
Production or injection tubular installed inside casing to provide a controlled flow conduit and interface with downhole completion equipment.
Tubular & Handling
Pup Joint
A short length of tubular supplied with specified size, grade, length and connections to adjust a string or equipment spacing.
Tubular & Handling
Coupling
A threaded sleeve used to join compatible tubular ends, selected by size, grade, thread form, clearance and service.
Tubular & Handling
Thread Protector
A reusable or disposable cover fitted to pin or box connections to prevent impact, dirt, moisture and coating damage during logistics.
Tubular & Handling
Tubing Elevator
A hoisting tool that closes around or supports tubing through an identified profile, size and rated load during handling operations.
Tubular & Handling
Slip
A tapered gripping device with dies that transfers tubular load into a matching bowl or rotary support during handling.
Tubular & Handling
Power Tong
A powered tool used to make up or break out tubular connections under controlled torque, speed and gripping arrangements.
Tubular & Handling
Backup Tong
A reaction tong that holds the stationary tubular while another tong applies make-up or break-out torque to the connection.
Tubular & Handling
Spider
A load-supporting handling tool fitted with slips and positioned on the rig floor or equipment to suspend tubular strings.
Tubular & Handling
Safety Clamp
A clamp applied around a tubular as a secondary handling restraint, selected for the outside diameter and intended load range.
Tubular & Handling
Elevator Link
A matched pair of load-rated links connecting a hoisting block or hook arrangement to an elevator during tubular handling.
Mud Systems & Pumps
Mud Pump
A high-pressure reciprocating pump used to circulate drilling fluid, commonly specified by model, liner size, stroke and rated power.
Mud Systems & Pumps
Triplex Pump
A reciprocating pump with three cylinders, usually single acting in drilling service, that produces flow as the crankshaft cycles the pistons.
Mud Systems & Pumps
Pump Liner
A replaceable cylinder sleeve that guides the mud-pump piston and defines the fluid-end displacement for a given stroke.
Mud Systems & Pumps
Pump Piston
A reciprocating sealing assembly that moves within a liner to displace drilling fluid and is selected for liner bore and service.
Mud Systems & Pumps
Valve and Seat
A matched mud-pump fluid-end pair that opens and closes with pressure changes to direct suction and discharge flow.
Mud Systems & Pumps
Fluid End Module
The high-pressure mud-pump body containing liner, valve, seat and passage interfaces, selected for a particular pump model and design.
Mud Systems & Pumps
Pulsation Dampener
A gas-charged or mechanical device used to reduce pressure and flow pulsations in a reciprocating pump discharge or suction system.
Mud Systems & Pumps
Shale Shaker
A vibrating solids-control machine that separates drilled solids from returning fluid across replaceable screen panels.
Mud Systems & Pumps
Shaker Screen
A replaceable screening panel selected by shaker fit, screen designation, conductance, cut point and service durability.
Mud Systems & Pumps
Desander
A hydrocyclone-based solids-control stage generally arranged to remove coarser particles from drilling fluid after primary screening.
Mud Systems & Pumps
Desilter
A hydrocyclone-based solids-control stage using smaller cones to separate finer particles than a typical desander arrangement.
Mud Systems & Pumps
Mud Cleaner
A combined hydrocyclone and fine-screen unit that processes cone underflow to recover fluid while discharging separated solids.
Mud Systems & Pumps
Decanter Centrifuge
A rotating bowl and scroll machine used to separate fine solids from liquid according to density, particle size and operating settings.
Mud Systems & Pumps
Solids Control
The equipment and operating process used to remove drilled solids, manage fluid properties and route drilling-fluid streams.
Mud Systems & Pumps
Mud Tank
A compartmented fluid vessel equipped as required with agitation, piping, valves and access for storing or conditioning drilling fluid.
Production & Artificial Lift
Sucker Rod
A threaded rod used in a reciprocating artificial-lift string to transmit surface unit motion to a subsurface pump.
Production & Artificial Lift
Polished Rod
A smooth surface rod that passes through the wellhead stuffing box and connects the surface pumping unit to the rod string.
Production & Artificial Lift
Sucker Rod Pump
A downhole reciprocating pump operated through a sucker-rod string and specified by bore, barrel, plunger, valves and seating arrangement.
Production & Artificial Lift
Pumping Unit
A surface machine that converts prime-mover rotation into reciprocating polished-rod motion for a sucker-rod pumping system.
Production & Artificial Lift
Polished Rod Load
The axial load measured or calculated at the polished rod and used when selecting or evaluating pumping-unit and rod-string capacity.
Production & Artificial Lift
Stuffing Box
A wellhead sealing assembly around a moving polished rod that controls produced-fluid leakage using replaceable packing elements.
Production & Artificial Lift
Production Packer
A downhole completion tool set to seal the annulus between tubing and casing and support defined production or injection functions.
Production & Artificial Lift
Tubing Anchor
A downhole tool used to anchor or tension a tubing string within casing for selected completion or pumping conditions.
Production & Artificial Lift
Electric Submersible Pump
A downhole multistage centrifugal pump system driven by a submersible electric motor and supplied with cable, protector and associated equipment.
Production & Artificial Lift
Variable Speed Drive
An electronic drive that controls motor frequency and voltage to adjust speed within the permitted operating envelope of an artificial-lift system.
RFQ & Logistics
Request for Quotation
A buyer document asking suppliers to quote defined items, quantities, technical requirements, documents, delivery conditions and commercial terms.
RFQ & Logistics
Bill of Quantities
A structured list of requested line items and quantities, often extended with specifications, drawings, document requirements and delivery information.
RFQ & Logistics
Original Equipment Manufacturer
The organization identified as the original maker or design owner of equipment; buyers should distinguish OEM supply from compatible aftermarket alternatives.
RFQ & Logistics
Interchangeable Part
A replacement claimed to fit and function in place of another part, requiring verification of dimensions, materials, interfaces and performance limits.
RFQ & Logistics
Nameplate
A durable equipment identification plate that may show manufacturer, model, serial number, ratings, date and certification markings useful for spare-part RFQs.
RFQ & Logistics
Serial Number
A unique equipment identifier that can connect a unit to manufacturing records, configuration, service history and compatible spare parts.
RFQ & Logistics
Incoterms
ICC trade rules used in sales contracts to allocate delivery tasks, costs and risks; the named rule should include an exact named place and edition.
RFQ & Logistics
Ex Works
An Incoterms rule under which the seller makes goods available at the named place while the buyer assumes most transport and export responsibilities.
RFQ & Logistics
Free on Board
An Incoterms rule for sea or inland waterway transport in which delivery occurs when goods are placed on board at the named port.
RFQ & Logistics
Cost Insurance and Freight
An Incoterms rule for sea transport where the seller contracts freight and specified insurance to the named destination port, while risk transfers earlier.
RFQ & Logistics
Delivered at Place
An Incoterms rule under which the seller delivers goods ready for unloading at the named destination while import clearance remains with the buyer.
RFQ & Logistics
Lead Time
The elapsed time from an agreed commercial starting point to a stated manufacturing, readiness or delivery milestone, with assumptions clearly defined.
RFQ & Logistics
Packing List
A shipment document listing package marks, contents, quantities, dimensions, net weight and gross weight for handling and customs support.
RFQ & Logistics
Commercial Invoice
A trade document stating seller, buyer, goods, values, currency and transaction details used for payment and customs processes.
RFQ & Logistics
HS Code
A customs classification code based on the Harmonized System; final classification depends on the actual product and importing-country rules.
RFQ & Logistics
Gross Weight
The combined weight of goods, immediate packaging, cases, pallets and other included packing materials for a shipment or package.
RFQ & Logistics
Net Weight
The weight of the goods themselves excluding external packing, cases, pallets and other shipment packaging materials.
RFQ & Logistics
Cubic Metre
A metric unit of volume used to summarize export package space from external length, width and height measurements.
RFQ & Logistics
Export Packing
Packaging designed for the chosen transport, handling, storage and environmental exposure, often including cases, skids, barriers, marks and preservation.
RFQ & Logistics
Preservation
Temporary protection against corrosion, contamination, moisture or deterioration during storage and transport, defined by method and intended duration.
Standards & Quality
Quality Control Plan
A supplier plan defining controls, responsibilities, records and acceptance activities used to demonstrate conformity during manufacturing and inspection.
RFQ & Logistics
Required Delivery Date
The contractually defined date or milestone by which goods must be ready, shipped or delivered at the stated location under agreed conditions.